GET request is not actually sent sometimes, but returns data from the cache

How to reproduce:
1. Put the following link into poster:
http://s3.amazonaws.com/cb_test/postertest.txt
2. Click GET button several times with the interval 1-5 seconds.
3. Notice that only the firs request is sent over the wire (returning either 
200 Ok, or 304 Not Modified).
You can easily track it by the Date header "returned" from the server.

Expected result: 
1. I'd like to see that new request is always being sent over the wire, or 
there should be a setting that allows to do this.
2. If there'd be a setting, it should also allow to force content reload, so no 
If-NoneMath, If-Modified-Sicne,etc, are sent with the request.

Poster version 3.1.0, Firefox 28.0. OS: Windows 7x64 Ult.

Additional info:
After some time passes (apporx 2 min 30 sec after the actual request) the 
request is sent again, but then the same situation.

After some time

Original issue reported on code.google.com by iva...@cloudberrylab.com on 28 Apr 2014 at 4:25

hbdrawn / poster-extension

GET request is not actually sent sometimes, but returns data from the cache #112